The market square (Marktplatz) is in all probability the best-known square in Karlsruhe. Situated on it is the city's hallmark, the pyramid, built in 1823 as well as the municipal protestant church, the town hall, and the market fountain.
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Information https://www.karlsruhe-tourismus.de/en/overview-map/Sights/Highlights/Market-Square-Marktplatz-and-the-Pyramid